your credit rating is a huge factor in getting a loan whether it's a car or a home loan. bad credit means you'll have a hard time getting approved or they'll rape in interest rates. great credit will open tons of doors and get you great deals. you may need a co-signer to get a good rate.
when i bought the Ranger I had, i didn't have enough established credit so i could only lease it on my own, but my dad co-signed and that got me 0% due to his excellent credit history. you may want to try
www.lendingtree.com. good luck.